[PATCH] ARM: V7M: Do not corrupt vector table around v7m_invalidate_l1 call
From: Vladimir Murzin <hidden>
Date: 2017-03-30 08:09:50
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
We save/restore registers around v7m_invalidate_l1 to address pointed
by r12, which is vector table, so the first eight entries are
overwritten with a garbage. We already have stack setup at that stage,
so use it to save/restore register.
Fixes: 6a8146f420be ("ARM: 8609/1: V7M: Add support for the Cortex-M7 processor")
Signed-off-by: Vladimir Murzin <redacted>
---
arch/arm/mm/proc-v7m.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mm/proc-v7m.S b/arch/arm/mm/proc-v7m.S
index 8dea616..5049777 100644
--- a/arch/arm/mm/proc-v7m.S
+++ b/arch/arm/mm/proc-v7m.S@@ -147,10 +147,10 @@ __v7m_setup_cont: @ Configure caches (if implemented) teq r8, #0 - stmneia r12, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6 + stmneia sp, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6 blne v7m_invalidate_l1 teq r8, #0 @ re-evalutae condition - ldmneia r12, {r0-r6, lr} + ldmneia sp, {r0-r6, lr} @ Configure the System Control Register to ensure 8-byte stack alignment @ Note the STKALIGN bit is either RW or RAO.
--
1.9.1